Automatic stopping mechanism for elevators.



T. LARSSON. AUTOMATIC STOPPING MECHANISM FOR ELEVATORS. APBLIGATIONTILED APR. 3, 1905, RENEWED MAY-27, 1912.

1,033, 181. Patented July 23, 1912.

is SHEEN-SHEET 1.

T. LARSSON. I AUTOMATIC STOPPING MECHANISM FOR ELEVATORS. APPLICATIONFILED APR. 3, 1905. RENEWED MAY 27, 1912.

1,033, 18 1 Patented July 23,1912.

3 SHEETS-SHEET 2.

T. LARSSON.

Y AUTOMATIC STOPPING MECHANISM FOR ELEVATORS.

APPLICATION FILED APR. 6 1905. RENEWED MAY 27, 1912. 1,033, 1 8 1.Patented July 23, 1912.

s SHEETS-SHEET a.

To all whomit may concern:

THURE LARSSON, or WORCESTER, mnssacnusnir'rs, AssIGNon T0 HIMSELF, wIL-LIAM E. n. s'ronfns, 0F NEW YORK, 1v. mnssacnusnrrs. y

Y., AND FRED a. JoNns, on woaonsrnn,

auronia'rio s'rorrmel'nnomrsm roe nnnva'rons. 1

v Specification of Letters Patent.

Patented Jul 23, 1912.

Application filed April 3, 1905, semi N0. 263,673. Renewed-May '27,1912'. .SerialNo. 700,082.

' Be it known that I, -THURE LAnssoN, a subject of the King of Sweden,residing at Worcester, in the county" of \Vorcester and State ofMassachusetts, have invented a new and useful Automatic StoppingMechanism for Elevators, of which the following is a specification- Thisinvention relates to a governor-device inside the plunger casing of aplunger elevator-for controlling the outlet to the toand-from pipe incase of accident; and to a combination of the governor device-with-a-stop mechanism.

In the accompanying three sheets of I drawings, Figure lis a side viewpartly broken away of sufiicient parts of a plunger elevator toillustrate the application of this invention thereto. Fig;2 is a planview of vice inside the plunger casing. Fig. sectional view of thecasing-head.

the same. Fig. 3 isv a die rammatic view illustrating the action of t egovernor de- 4 is a i r is a transverse sectional view thereof. Fig. 6is a fragmentary view of the governor de vice. Fig. 7 is a side view ofsufiicient parts of a lunger elevator plant to illustrate a modi ed formof construction and, Fig. 8 is a sectional view of the stop-valve whichcuts off the exhaust. from the to-and-from pipe when the car reaches thebottom of its run.

The principal object of my invention is to provide an automatic governordevice for controlling a hydraulic plunger elevator incase of accident,and tocombine thegovernor device with an automatic stop mechanisr'n.

The governor device is preferably located inside the cylinder-head, andas herein illustrated, this governor device, consists of a shifted so asto throttleor entirely out ofi connection with the to-and-fromp1pe,"thus slowing down the speedof the elevator.

o oration by accidents, sue ,for ez zample as t ebreaking of heto-and-from'pipe;-whi1e "the'combined action of the governor m I p isdescending.

nism and stop devices provides a variable stopping action which willvaryin accordance with thespeed at which the car isde scending. That isto say, while the or- -'dinary stopping connections are intended tocommence the operation'of retarding the car and finally bringing the carto rest at fixed points; by combininga governor mechanism withmystoppingdevices I am able to secure a variable stopgingeii'ect whichWlll havean earlier retar ing action in accordance'with thespeed atwhich the car Referring to the diailwings and in detail for ades'crlpt-ion ofconstructlon embodying this invention, G designatestheplunger casing of ordinary elevator; Running. up and downjn'the'.casing is a, plunger P which carries at its up'per end -.the car,D.

The car D as shown -"inn Fig'. 2 is guided on suitable'ways, and'also:guided in ways at the side of the car .D}is a counterweight W. Thestopping devices. may be operated either from a suitable abutment orwheel on the car, or from the counterweight.

for the The water supplying=connections plunger casing maybe arranged asshown in Fig. '2, and comprises the" to-and-from pipe T which may beconnected through a stopvalve 12 and the main valve V to the outlet 11,or which ma be. connected thr'ough a stop-valve 13 an the -main valveVto the inlet 10. The stopva1ves12 and 13 are of similar construction,and the outlet stop valve 12 is illustrated in Fig. 8.

In order to provide a contact bar which will operate reliably to stop ahigh speedelevator itfis essential that bar should stiff enoughto-resisttheheavy strains du t0 the impact: with the iioiing car orcounterweight, and in order to provide-a still andreliableiconstruction, -'I provide an 'arrangement of connected linkworkwhich forms; in

As shown in Fig. 1," 14 designates the contact bar-which is engaged by aroller or abutment A on the car. The contact bar 144s supported near itsupper end by a bellcrank 15,-near its center by a bell-crank 16 which isconnected thereto by an adjustable or sector 18-whioh is connectedthereto by an adjustable link, 19.- The other arms of thebll-crank -16and 17 and the sector 18 are by a -tension member or rodYO.

r The governor device me; be brought into Jink 1 7,"and nearits bottomby a bell-crank By ineans of this construction it will be seen thatthecontact bar 14 is supported at a plurality of points, and that anytendency sets of linlcwork being operated by the elevator car,- andthe'bottom set of link-work being connected by'suitable connections tooperate the stop valve 12; while the linkwork at the top of the run maybe connected tooperate the stop-valve 13. Each of the stopwa'lves 12 and13 is intended'to autonuitically stop the fiow of water through theto-and-from pipe. For example, the stopvalve 12, as shown in Fig. 8, isprovided with a piston Z which shut-s ofi. connections with the outletpipe 11 and 'stops' the car when it reachesrthe bottom of its run. Thestop-valve 13 for automatically stopping that car at the top of its runis of similar construction and need not be illustrated nor described atlength; In some cases, however, instead of employing link-work at thetop and bottom of the run, all the stopping connectionsmay be'arrangedat the bottom of the run, one set of link-work for stopping the car asitis coming down being controlled by'the, car. itself, and the second setof connectionsifor stopping the car at the top of its run beingcontrolled by an abutment or wheel B carried by the counterweight W,

the cbunterweight being set to reach the bottom of its run at the sametime that the car reaches the top of'its run.

The construction of the governor device is most clearly illustrated inFigs. 4 to 6. As shown in these figures,-. the. plunger cas--ingCis'providedf with an opening 28' for theto-and-from pipe T, andmounted inside the plunger casing is a shell 29. having a port normallyregistering with the opening 28. Openingabove the governor device orshell 29 is a throttling ,passage'31 having a throttling screw 32. -Thepassage 31 normally eq'ualizes the pressure above and below the governordevice. but ll'lfilSQOf an abnormal fall of pressure to thepiston casinsat? 'pipe andjeither retardingor stopping the fall, otf elevator ear.

' governorqdeyiee'inside' the'casi n rea ersresentsa ing, such forexample as would-be caused by the ,brealtingof the to-and-fro'ni pipe,the

governgr; device or shell QO wouldJ be raised at. thus throttling orentirely cutfrom its se onueetron Wltll;tl l e to-and-from This,automatic gofa plunt'a -with the t thebot ger eleva tort 'combine, toadvan tom- 0f: gain. any

As, shown in l l g l, the sector 18 has gear teeth meshing with-a pinionon a horizontal shaftifzt 8 Connected zlwith'gthe horizontal Uni-rip; 1:a

shaft 24. by bevel gears is-a second horizontal shaft 25 which extendsinto a casing 26 on the side of the plunger head.

As shown in Figs. 4 and 5, the shaft 25 is provided with aw0rm-whe'cl'27 which meshes with inclined teeth or grooves 30 in thegovernor device 29. By means of -this construction when the governordevice 29 is automatically lifted or raised, its upward travel will beguided by the engagement of the worm with the grooves therein, so thatit will be partly turned or rotated. This is of advantage, asit providesa variable throttling of the elevator'in case of emergency. This isillustrated in Fig. 3, which shows three possiblepositions of the portor opening of the governor device 29. That is to say, when the governordevice is lifted it will not only have throttling action on account ofits vertical motion, but it will ,also be more or less turned, so thatless mot-ion will be required from the link-work to entirely closeconnection between the plunger casing and the to-and-from pipethan whenthe governor" device is in its lower or normal position, and it is dueto this that by combining the governor device with the stop mechanism, Iam enabled to get a differential stopping act-ion, acting morepromptlyin case of emergency than during ordinary service conditions.

I am awarethat many changes may be made in practising my invention bythose who are skilled in the art, and while my invention so far as itrelates to the governor device is particularly adapted to a hydraulicplunger elevator, it is to be understood that mystopping mechanisms arealso applicable to elevators of other types. I do not wish, therefore,'to be limited to the particular constructions Ihave herein shown anddescribed, ut

WhatI do claim and desire to secure by Letters Patent of the UnitedStates is:'

1. In a plun er elevator system, the com bination of a plunger casing, aplunger vertically movable therein, a to-and-from pipe connected to theplunger casing, a throttling device mounted inthe plunger casing, andconsisting of a shell having a port normally registering with theopening to the to-andfrom pipe, and a restricted passage admitconnectionwith t e toand-from pipe.

2. In a plunger elevator system, the com-' bination of a plungerteasing, a plunger vertically movable therein, 'acar on the upper end ofthe plunger, a to-and-from pipe connected with the plunger casing, athrottling device inside the plunger casing, and connections foractuating the throttling device as the car approaches the end of itsrun.

'3. In aplunger elevator system, the comtically movable therein,

bination of a plunger casingya plunger ver- 1 nected with the plungercasing, a shell intic-ally movable therein, a car on the upper end ofthe plunger, a to-and-trom pipe connected with the plunger casing, arotatable shell mounted inside the plunger casing and acting as athrottling device between the plunger-casing and the to-and-t'rom pipe,and connections for turning the shell when the car approaches the end ofits run.

4. In a plunger elevator system, the combination of a plunger casing, aplunger vertically movable therein, a car on the upper end of theplunger, nected with the plunger casing, a throttling device inside theplunger casing operated by fluctuations of pressure to the plungercasing, and connections for also operating the throttling device as thecar approaches the .end of its run.

5. In a plunger elevator system, the combination of a plunger casing, aplunger vera car on the upper end of the plunger, a to-and-from pipecon- 0091a 01 this patent may be obtained for five cents each, byWashington, 11 0.

a to-and-from pipe con-' side the plunger casing acting as a throttlingdevice between the plunger-casing and the to-an l-from pipe, and aworm-Wheel connection for operating the shell when the car approachesthe end of its run, said worm-wheel connection also serving to turn theshell when the same is lifted by fluctuations of pressure to the plungercasing, whereby a variable cured.

6. In an elevator, ear and its plunger, enlarged portion, larged portionfor regulating the speed of travel of the car.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing witnesses.

THU RE LARSSON.

the combination with a of a cylinder havlngan Witnesses:

PHILIP W. SOUTI-IGATE, MARY E. REGAN.

addressing the Commissioner of Patents,

stopping action is se-- and means within said en- I

